CN203067915U - Fault diagnosis device of valve actuating mechanism - Google Patents

Abstract

The utility model discloses a fault diagnosis device for a valve actuator, comprising: an actuator, a sensor and a controller, the actuator is arranged at the entrance of the first water tank, the sensor is arranged at the top of the second water tank, and the controller sends out a positioning signal And transmit it to the actuator, the actuator receives the positioning signal and injects water into the first water tank, and sends a feedback signal to the controller; the sensor monitors the liquid level of the second water tank in real time, and transmits the liquid level signal to the controller; the controller receives the feedback signal and the liquid level signal, filter the liquid level signal, output the residual, and output the constant deviation change signal of the actuator, the constant gain change signal of the actuator or the stuck change signal of the actuator through the analysis of the residual error. The utility model is a fault diagnosis device based on a state observer, which realizes online fault diagnosis of valve actuators, finds faults existing in the operation process in time, and outputs corresponding fault signals, which meets the needs of practical applications.

Description

A Fault Diagnosis Device of Valve Actuating Mechanism

technical field

The utility model relates to the field of automatic control, in particular to a fault diagnosis device of a valve actuator.

Background technique

So far, the control theory is based on the assumption that the actuator works normally, so the reliability of the control system depends on the reliability of the corresponding actuator. Once the actuator fails, if it is not handled in time, it will affect the production and product quality. , which may lead to accidents. The actuator is a sensitive component in the information output device of the automatic control system, and its working state directly affects the state of the system.

In the process of realizing the utility model, it is found that there are at least the following shortcomings and deficiencies in the prior art:

The working environment of the actuator is complex, harsh, widely distributed, large in number and special in the installation position, making the actuator one of the weak links in the process control and the most prone to failure in the system. It is only by manpower to find and repair the actuator Faults are difficult to be timely and effective, and the reliability of the control system cannot be guaranteed.

Utility model content

The utility model provides a fault diagnosis device for a valve actuator. The fault diagnosis device realizes the online fault diagnosis of the valve actuator and finds faults in the operation process in time. See the following description for details:

A fault diagnosis device for a valve actuator, the fault diagnosis device includes: an actuator, a sensor and a controller,

The actuator is arranged at the entrance of the first water tank, the sensor is arranged on the top of the second water tank, the controller sends out a positioning signal and transmits it to the actuator, and the actuator receives the positioning signal and sends a signal to the actuator. The first water tank is filled with water, and a feedback signal is sent to the controller; the sensor monitors the liquid level of the second water tank in real time, and the liquid level signal is transmitted to the controller; the controller receives the feedback signal and the liquid level signal, filter the liquid level signal, output the residual, and output the constant deviation change signal of the actuator, the constant gain change signal of the actuator or the stuck actuator through the analysis of the residual error change signal.

The actuator is specifically a pneumatic regulating valve; the sensor is specifically a radar level gauge.

The beneficial effects of the technical solution provided by the utility model are: the utility model is a fault diagnosis device based on a state observer, which realizes the online fault diagnosis of the valve actuator, timely discovers the faults existing in the operation process, and outputs the corresponding The fault signal meets the needs in practical applications.

Description of drawings

Fig. 1 is a working schematic diagram of a fault diagnosis device of a valve actuator;

Fig. 2 is a structural schematic diagram of a fault diagnosis device for a valve actuator.

In the accompanying drawings, the list of parts represented by each label is as follows:

1: Actuator; 2: Sensor;

3: Controller; 4: The first sink;

5: Second sink.

Detailed ways

In order to make the purpose, technical solution and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below.

In order to improve the reliability, maintainability and safety of the control system, it is necessary to establish a monitoring system to supervise the operation status of the entire control system, and continuously monitor system changes and fault information. Then take necessary measures to prevent catastrophic accidents in the system, but the premise is that the monitoring system must have the ability to monitor and diagnose faults online.

Referring to Fig. 1 and Fig. 2, a fault diagnosis device for a valve actuator includes: an actuator 1, a sensor 2 and a controller 3,

The actuator 1 is set at the entrance of the first water tank 4, the sensor 2 is set on the top of the second water tank 5, the controller 3 sends a positioning signal and transmits it to the actuator 1, and the actuator 1 receives the positioning signal and fills the first water tank 4 with water , send a feedback signal to the controller 3; the sensor 2 monitors the liquid level of the second water tank 5 in real time, and transmits the liquid level signal to the controller 3; the controller 3 receives the feedback signal and the liquid level signal, and performs filtering processing on the liquid level signal , output the residual, through the analysis of the residual, output the constant deviation change signal of the actuator, the constant gain change signal of the actuator or the stuck change signal of the actuator.

Further, in order to improve the versatility of the fault diagnosis device, the actuator 1 can be a pneumatic regulating valve; the sensor 2 can be a radar level gauge.

The filter in the controller 3 performs filter processing on the liquid level signal, and outputs the residual through the filtered signal. The specific operation process is well known to those skilled in the art, and will not be repeated in this embodiment of the utility model.

The working principle of the fault diagnosis device: when the actuator in the control system fails, the filter in the controller 3 will not correctly reflect the system characteristics after the fault occurs, and the output residual will not be zero, and the output error will be analyzed Observation can determine whether a fault has occurred.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred embodiment, and the serial numbers of the above-mentioned embodiments of the utility model are only for description, and do not represent the advantages and disadvantages of the embodiments.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (3)

1. A fault diagnosis device of a valve actuator, characterized in that, the fault diagnosis device comprises: an actuator, a sensor and a controller, The actuator is arranged at the entrance of the first water tank, the sensor is arranged on the top of the second water tank, the controller sends out a positioning signal and transmits it to the actuator, and the actuator receives the positioning signal and sends a signal to the actuator. The first water tank is filled with water, and a feedback signal is sent to the controller; the sensor monitors the liquid level of the second water tank in real time, and the liquid level signal is transmitted to the controller; the controller receives the feedback signal and the liquid level signal, filter the liquid level signal, output the residual, and output the constant deviation change signal of the actuator, the constant gain change signal of the actuator or the stuck actuator through the analysis of the residual error change signal. 2 . The fault diagnosis device for a valve actuator according to claim 1 , wherein the actuator is specifically a pneumatic control valve. 3 . 3 . The device for fault diagnosis of a valve actuator according to claim 1 , wherein the sensor is specifically a radar liquid level gauge. 4 .

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